Outer building wall air heating device with a heat exchanger

ABSTRACT

The invention relates to an outer building wall heating device with a heat exchanger comprising a mainly reversed U-shaped outer wall part, closed at the bottom end, an inner wall part lying inside the outer wall part and having a mainly triangular shape with downwardly directed top lying at some distance above the bottom of the outer wall and an air inlet stud formed in the rear wall of the outer wall and an air outlet stud formed in an inclined partition having its under edge connected to the top of the inner wall and its upper edge connected to the rear wall of the outer wall of the heat exchanger and lying within the contours of the air inlet stud, all heat exchanger parts consisting of corrugated of like sheet material.

United States Patent Van Der Goot [451 Sept. 5, 1972 [54] OUTER BUILDINGWALL AIR HEATING DEVICE WITH A HEAT EXCHANGER [72] Inventor: Arnold VanDer Goot, Voorbroek 9,

Terborg, Netherlands [22] Filed: Nov. 4, 1970 [21] Appl. No.: 86,717

[30] Foreign Application Priority Data Nov. 14, 1969 Netherlands ..69/17139 [52] US. Cl ..126/85 B, 126/90 R [51] Int. Cl. ..F23l 17/04, F24h3/00 [58] Field of Search ..126/85 R, 85 A, 90 R, 91 R,126/11OR,11OB,116R,116B

[56] References Cited UNITED STATES PATENTS 2,192,920 3/1940 Linch..126/90 R 3,348,533 10/1967 Wilhoite ..126/85 B X FOREIGN PATENTS ORAPPLICATIONS 215,119 5/1961 Austria ..126/85 B Great Britain ..126/85 BFrance ..126/85 B Primary Examiner-Charles J. Myhre Attorney-W. G. Fasse57] Z ABSTRACT The invention relates to an outer building wall heatingdevice with a heat exchanger comprising a mainly reversed U-shaped outerwall part, closed at the bottom end, an inner wall part lying inside theouter wall part and having a mainly triangular shape with downwardlydirected top lying at some distance above the bottom of the outer walland an air inlet stud formed in the rear wall of the outer wall and anair outlet stud formed in an inclined partition having its under edgeconnected to the top of the inner wall and its upper edge connected tothe rear wall of the outer wall of the heat exchanger and lying withinthe contours of the air inlet stud, all heat exchanger parts consistingof corrugated of like sheet material.

7 10 Claims, 1 Drawing Figure PATENTED P 5 I INVEN'I'UR:

ARNOLD VAN DER G001 OUTER BUILDING WALL AIR HEATING DEVICE WITH A HEATEXCHANGER BACKGROUND OF THE INVENTION 1. Field of the Invention Outerbuilding wall air heating device with a heat exchanger.

2. Description of the Prior Art Such an outer building wall air heatingdevice is already known. In this known device the heat exchangerconsists of parts of flat sheet material or cast iron which are weldedtogether. The construction is consequently heavy and laborious andexpensive in manufacture.

SUMMARY OF THE INVENTION The invention aims at providing a constructionfor the heat exchanger which is particularly easy in manufacture and atthe same time can be made with a very low weight and very cheaply, butin addition possesses particularly favorable heat exchanging properties.

According to the invention this is obtained by that the heat exchangeris formed by a mainly reversed U- shaped outer wall part closed at thebottom end by a bottom plate, an inner wall part having mainly the shapeof a triangle with downwardly directed top lying at some distance abovethe bottom plate, while the mutually parallel upper walls of the outerwall part and the inner wall part are provided with correspondingapertures of which the side walls are interconnected at the inside ofthe apertures, whereas between the top of the inner wall part and therear wall of the outer wall part an inclined partition is arrangedprovided with a bent out tube stud extending freely through an openingin the adjacent upstanding rear wall of the outer wall part, while thetwo lateral ends of the two wall parts are closed by side wall partsleaving free, at least in part, the internal space of the inner wallpart. Such a heat exchanger requires little welding work and can easilybe composed of a small number of parts.

Preferably the construction is made such that the two wall parts and theinclined partition consist of corrugated or acute angled zigzag ribbedsheet material of which the tops of the corrugations or ribs runperpendicularly to the direction of bending of the two wall parts. Inthis way not only the advantage of a good heat exchanger is obtained asa consequence of a relatively enlarged heat exchanging area, but,besides the possibility is created for the formation of apertures in thehorizontal upper portion, which are necessary for the heating of the airand which can be easily formed of the material of the wall parts by theuse of the corrugated or ribbed sheet material and can be interconnectedalong their edges.

For the formation of channels for the admission of combustion air andfor the discharge of the flue gases and for sealing purposes withrespect of the surrounding space to be heated, furthermore,appropriately, the openings in the upstanding rear wall of the outerwall part and in the inclined partition can each be connected to asleeve, which extends through the outer building wall to the outside,while around the whole heat exchanger a housing is arranged, which canbe sealed with respect of the outer wall part of the exchanger and withrespect of the outer building wall. Also this construction isparticularly simple and easily adaptable to each possible thickness ofthe outer building wall.

BRIEF DESCRIPTION OF THE DRAWING The drawing shows a verticalcross-section of an outer building wall air heating device with heatexchanger according to the invention.

DESCRIPTION OF PREFERRED EMBODIMENT OF THE INVENTION In the drawing 1indicates the housing of the heating device. In the housing a heatexchanger is arranged at an adequate distance all around for aircirculation and which is formed by a mainly reversed U-shaped outer heatexchanger casing 2, closed at the bottom side by a bottom plate 3. Inthe space enclosed by this outer casing 2 an inner heat exchanger casing4 is situated, having mainly the shape of a triangle with the topdirected downwards. Both heat exchanger casings 2 and 4 are made ofcorrugated or acute angled zigzag ribbed sheet material of which theribs lie in vertical planes and perpendicular to the bending axes of thewall parts. The upper portion 5 of the inner casing 4 lies parallel tothe body portion 6 of the outer casing 2 which is mainly horizontal. Inthe parallel wall portions of the two casings 2 and 4 apertures 10 arecut out, of which the edges are bent towards one another, which isrendered possible by the used corrugated of ribbed sheet material,thusforming studs running transversely through the heat exchanger and ofwhich the edges meet about in the middle between the two parallel wallpart portions 5 and 6 and lie against one another with flanges 7 and 8extending radially inwards into the formed apertures and areinterconnected for example, in that one of the flange rims, e.g. theflange rim 8, is made broader than the other one and folded back aroundthis other flange rim 7. The two casings 2 and 4 of the heat exchangerare therefore interconnected along the folds 9 of the apertures 10. Atthe bottom end 11 the two triangle sides 4a and 4b of the inner casing 4are interconnected at some distance from the bottom plate 3. At 11 alsoa partition 12, also of ribbed or corrugated sheet material with ribslying in vertical planes, is connected to the inner casing 4, e.g. bywelding or spot welding. This partition 12 is connected to theupstanding rear wall 2b of the outer casing 2 along its upper rim. Inthis partition an opening 13 is cut out, of which the edge is bent outand forms a tube stud 14, On this tube stud or pipe fitting 14 a sleeve15 is pushed on, which extends through the outer building wall 16 and isclosed at the outer end by a perforated cover 17. For enlarging thepassage to the opening 13 in this partition the upper portion of theopposite rear wall 4b of the inner casing 4 is bent inwards and providedwith an inclined joining portion 40, which joins the partition 12 nearthe under rim of the opening 13. At the lateral sides the heat exchangeris closed by walls Ila of flat sheet material which interconnect theinner and outer casings 4, 2 but which leave free or open the innerspace of the inner casing 4 at both ends.

The tube stud 14 extends through an opening 18 formed in the upstandingrear wall 2b of the outer casing 2 of the heat exchanger and of whichthe rim 19 is bent out. Around this bent out rim or collar 19 lies asealing or heat insulating ring 20, e.g. of asbestos cord or othersuitable material, which on the other hand is enclosed in a peripheralgroove 21, formed along an inwardly impressed ring-shaped groove 22 inthe rear wall 1b of the housing 1, In the impressed ring-shaped groove22 a second sealing ring 23 is arranged, lying at the outside of thehousing, e.g. also of asbestos cord. To the rim of the opening 21 in therear wall 1b of the housing, furthermore, a short sleeve 24 isconnected, e.g. by welding or spot welding. On this sleeve 24 a secondsleeve 25 is pushed on, of which the outer rim 26 is bent back and liesagainst the outside of the outer building wall 16. In the tube 25 aperforated ring 28, having an inwardly bent rim 29, is arranged with theaid of tongues 27 bent out inwardly, which ring supports the innersleeve 15 running through it at the outer end eccentrically, displacedupwards.

g In the under portion of the heat exchanger a burner 30 is arranged inthe front portion between the upstanding front wall 2a of the outer wallpart and the upstanding front wall l4a of the inner wall part and theupstanding front wall 4a of the inner wall part, which burner isconnected to the fuel supply means in a not shown manner.

The operation of the described device is as follows.

If the burner 30 is ignited, the generated heat will create an upwardsflow of the flue gases above the burner, whereby fresh combustion air isdrawn through the sleeves 25 and 24 and the opening 19 in the rear wall2b of the outer wall part of the heat exchanger and through the spacebetween the lower end 11 of the inner wall part and the bottom plate 3,whereby the combustion can continue. The flue gases flow upwards betweenthe wall portions 2a and 4a of the heat exchanger, heating thecorrugated or zigzag ribbed walls. Then the flue gas stream bendsbackwards and flows through the horizontal upper portion of the heatexchanger round the sidewalls of the apertures 10. Thereafter the fluegas stream bends down between the rear wall portions 2b and 4b of theheat exchanger and then streams further through the opening 13 in theinclined partition 12 and the tube stud 14 with outlet sleeve 15connected to it and carrying the perforated cover 17, to the outside.

The room air streams upwards through the housing 1 in the space lyingaround the heat exchanger, and further through the two laterally openends of the inner casing 4 air can stream into the internal spacebetween the inner walls 4a and 4b and can ascend through the apertures10 after having taken up heat.

As may have appeared from the above description, with a stove of thekind described, no combustion air is drawn from the space to be heated,but as well the combustion air as the flue gases aredirectly suppliedfrom the outside air and discharged to the outside respectively, withouta chimney being necessary. Therefore only a heating of the air takesplace in the space to be heated.

The shown and described device is particularly favorable in view of theheat transmission and it is particularly simple in constructive respectand it IS easy and cheap in manufacture.

What is claimed is:

1. In aheater connectable to an outer building wall and includingheating means as well as a heat exchanger having an outer casing with aclosed bottom and an inner casing of substantially triangularcrosssection with a downwardly pointing end, the improvement comprisingfirst wall means forming said outer heat exchanger casing and includingan upper outer casing wall, a first aperture in said upper outer casingwall, second wall means forming said inner heat exchanger casing andincluding an upper inner casing wall, a second aperture in said upperinner casing wall, means for interconnecting said first and second wallmeans around said first and second apertures, whereby space surroundingsaid outer casing is connected to space in said inner casing, a rearwall as part of said first wall means of said outer heat exchangercasing, third wall mean extending slantedly upwardly and connected tosaid downwardly pointing end of said inner heat exchanger casing as wellas to said rear wall of said outer heat exchanger casing, a thirdaperture in said third wall means, pipe fitting means, means forattaching said pipe fitting means to said slanted third wall meansaround said third aperture, an opening in said rear wall of said outerheat exchanger casing positioned so that said pipe fitting means extendfreely through said opening, said inner heat exchanger casing having atleast partially open lateral ends, and lateral end wall means forinterconnecting said inner and outer heat exchanger casings to eachother.

2. The heater according to claim 1, wherein the first and second wallmeans of said inner and outer casings as well as said slanted third wallmeans are made of corrugated sheet material including corrugationsextending substantially perpendicularly to a direction in which saidwall means are bent.

3. The heater according to claim 1, wherein said first and second andthird wall means are made of sheet material having a zig-zagcross-section with ridges extending substantially perpendicularly to adirection in which said wall means are bent.

4. The heater according to claim 1, further comprising first and secondsleeve means extending through a hole in said building wall, a collarsurrounding said opening in said rear wall for releasably joining saidopening to said first sleeve, means for releasably connecting saidsecond sleeve to said pipe fitting connected to said third aperture insaid slanted third wall means, a heater housing located about said outerheat exchanger casing, and means for heat insulating said heater housingfrom direct contact with said outer heat exchanger casing and fromdirect contact with said building wall.

5. The heater according to claim 4, wherein said second sleeve meansextends through said first sleeve means, said heater further comprisingperforated ring wall means for supporting said second sleeve means insaid first sleeve means.

6. The heater according to claim 5, further comprising an aperturedcover member for covering said second sleeve means at its end extendingout of said hole in the building wall.

7. The heater according to claim 5, wherein said first and second sleevemeans each have a respective longitudinal axis whereby both axes extendin parallel to each other, said sleeve means being arranged relative toeach other so that the longitudinal axis of the second ing has at leastone bend therein to provide for said spacing.

10. The heater according to claim 1, wherein said means forinterconnecting said first and second wall means comprise inwardly andoutwardly drawn collar means, and means for joining said collar means toeach other intermediate said apertures. V

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3.688.759 Dated September 5. 1972 Inventor) Arnold Van Der Goot It iscertified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shown below:

On the cover sheet, insert [73] Assignee Metaalv varenfabriek Joh. Th.Benraad N V; Ettensestraat, Terborg, Netherlands Signed and sealed this1st day of May 1973.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. I ROBERT GOTTSCHALK Attesting Officer Commissionerof Patents FORM Po-1o5o (10-59) UsCOMM-DC 60376-P69 use GOVERNMENTPRINTING OFFICE 19:9 o-aes-sn,

1. In a heater connectable to an outer building wall and includingheating means as well as a heat exchanger having an outer casing with aclosed bottom and an inner casing of substantially triangularcross-section with a downwardly pointing end, the improvement comprisingfirst wall means forming said outer heat exchanger casing and includingan upper outer casing wall, a first aperture in said upper outer casingwall, second wall means forming said inner heat exchanger casing andincluding an upper inner casing wall, a second aperture in said upperinner casing wall, means for interconnecting said first and second wallmeans around said first and second apertures, whereby space surroundingsaid outer casing is connected to space in said inner casing, a rearwall as part of said first wall means of said outer heat exchangercasing, third wall mean extending slantedly upwardly and connected tosaid downwardly pointing end of said inner heat exchanger casing as wellas to said rear wall of said outer heat exchanger casing, a thirdaperture in said third wall means, pipe fitting means, means forattaching said pipe fitting means to said slanted third wall meansaround said third aperture, an opening in said rear wall of said outerheat exchanger casing positioned so that said pipe fitting means extendfreely through said opening, said inner heat exchanger casing having atleast partially open lateral ends, and lateral end wall means forinterconnecting said inner and outer heat exchanger casings to eachother.
 2. The heater according to claim 1, wherein the first and secondwall means of said inner and outer casings as well as said slanted thirdwall means are made of corrugated sheet material including corrugationsextending substantially perpendicularly to a direction in which saidwall means are bent.
 3. The heater according to claim 1, wherein saidfirst and second and third wall means are made of sheet material havinga zig-zag cross-section with ridges extending substantiallyperpendicularly to a direction in which said wall means are bent.
 4. Theheater according to claim 1, further comprising first and second sleevemeans extending through a hole in said building wall, a collarsurrounding said opening in said rear wall for releasably joining saidopening to said first sleeve, means for releasably connecting saidsecond sleeve to said pipe fitting connected to said third aperture insaid slanted third wall means, a heater housing located about said outerheat exchanger casing, and means for heat insulating said heater housingfrom direct contact with said outer heat exchanger casing and fromdirect contact with said building wall.
 5. The heater according to claim4, wherein said second sleeve means extends through said first sleevemeans, said heater further comprising perforated ring wall means forsupporting said second sleeve means in said first sleeve means.
 6. Theheater according to claim 5, further comprising an apertured covermember for covering said second sleeve means at its end extending out ofsaid hole in the building wall.
 7. The heater according to claim 5,wherein said first and second sleeve means each have a respectivelongitudinal axis whereby both axes extend in parallel to each other,said sleeve means being arranged relative to each other so that thelongitudinal axis of the second sleeve means is located above thelongitudinal axis of the first sleeve means.
 8. The heater according toclaim 1, wherein said inner heat exchanger casing has a rearwardlyfacing wall which is arranged relative to the third upwardly slantedwall means to provide a spacing between the rearwardly facing wall andthe third wall means.
 9. The heater according to claim 8, wherein saidrearwardly facing wall of said inner heat exchanger casing has at leastone bend therein to provide for said spacing.
 10. The heater accordingto claim 1, wherein said means for interconnecting said first and secondwall means comprise inwardly and outwardly drawn collar means, and meansfor joining said collar means to each other intermediate said apertures.